Punch and die retainer



C. 0., C. A. AND 0. K. RICHARD.

PUNCH AND DIE RETAINER.

Patented Oct. 11, 19

iiimmlm- 4 w l'r x 221mm. 2 J 1 WWI I W m VJ UNITED STATES PATENTOFFICE.

CLEMENT C. RICHARD, CLARENCE A. RICHARD, AND OTIS K. RICHARD, orDETROIT, MICHIGAN.

HHSSUED Specification of Letters Patent.

Patented Oct. 11; 1921.

Application filed November 19, 1919. Serial No. 389,136.

Improvement-in Punch and Die Retainers,

and declare the following to be a full, clear, and exact description ofthe same, such as will enable others skilled in the art to which itpertains to make and use the same, refer-- ence being had to theaccompanyin drawings, which form a part of this speci cation.

This invention relates to tool retainers and the principal object of theinvention is to provide a retainer means for the tool to preventwithdrawal thereof from the holder. The principal feature of theinvention is involved in the provision of a retainer having an aperture'for the tool shank and an angularly positioned aperture opening intothe said first named aperture and containing a spring pressed ballpartially extendin into the tool retaining aperture to binding yengagethe shank of the tool and prevent wlthdrawal of the tool from theretalner. A further feature of the invention is involved in theconstruction of the tool shank in which a groove is formed to receivethe ball, the

groove in cross section having a radius equal to the radius of the balland which when the ball is seated therein prevents rotation of the toolin relation to the retainer. An addi tional feature of the invention isinvolved in the peculiar character of the ball receiving groove whichgroove is arcuate in a plane parallel to the longitudinal axis of thetool and also in a plane at a rightangle thereto, the radius of'thelatter form being equal to that of theball whereby the tool isaccurately positioned and held from rotative movement. Another featureofthe invention resides'in the -provisi'rnn-of a punch: and die retainerof the character above set forth in which the ball retaining 'aperture'for' the angle substantially opposite to that of the' ball retaimnaperture for the punch whereby the with rawal movement of the punch fromthe'die prevents the longitudinal movement of either tool in its holderand prevents thedie from following the punch or the punch from remainingin the die. Thesethe ball is and other objects and the several novelfeatures of the invention are hereinafter more fully described andclaimed and the preferred form of construction is shown inv the accpnpanymg drawings in which 2- I* igure 1 is a section througha punch anddie and retainers therefor illustrating the means for securing a punchor die in the respective retainer. i

F g. 2 is a section through the punch and retainer taken on line 2-2 ofFig. 1.

We have preferably shown in the drawing a tool retainer as used with apunch and die and as will be noted the retainer 1 is formed with anannular flange 2 at the upper end thereof which is secured a ainst thepunch plate 16 by means of a mem er 3 fitting over the said annularflange and encircling the retainer and secured to the punch late 16 byfillister head screws 17 shown in ig. 1. In

this manner the retainer is secured to the punch'plate and held fromrotation and as will be noted the retainer 1 is centrally apertured toreceive the punch shank. Within the wall of the said retainer is anangularly positioned aperture 4 in which a ball 5 is positioned.Adjacent the end of the aperture opposite rovided an annular groove inwhich is positioned a spring washer 6 against WhlCh one end of thespring engages the opposite end of the spring engaging against the ball5 as shown. It is to be noted that the aperture 4: opens into thecentral aperture but that the opening between the two apertures is lessthan the diameter of the ball 5 thereby preventing the ball from passingout of the aperture 4 at the bottom. As Wlll be noted from Fig. 1 thepunch shank 8 is provided with a roove arcuate in a plane parallel withthe ongitudinal axis of the punch and also arcuate in a plane at a rightangle to the aforesaid plane, the radius of the last vnamed groove beingequal to the radius of the ball '5. It, can be seen more particularlyfrom Fig. 2 that the ball 5 extends into the groove 9 in the-punch shankand is tightly held in engagement therein by the spring 7 the oppositeside of the ball at the same time eng mg the angularly positioned wallof the aperture 4.

In the lower half of Fig. 1 is shown a die .or die block .10 which .isheld in aretainer similar to that of the unch shank and this die blockis "provided with a groove 9 similar tothe groove 9 in the punch shank.The retiter negatively" v whereupon at at the punch ordf block maybee'as'ily ea drawntainer 1" is also provided withan angularlypositioned aperture 4 in" the Wall thereof and a central aperture isprovided therein to receive 'the'die'or die block 10. Within theaperture l qis provided .a spring" washer 6 against which one end of thesprlng 7 engages, the opposite end of the said spring engaging the ball5 which device is similar to that shown in the upper half of Fig. 1',"

being positioned at an opposite angle as shown. The spring 7* in likemanner forces the ball into the arcuate groove 9 of the die or die block10 and prevents the same from withdrawal from the retainer. The retaineris also provided with an annular flange 2 and a member 3* is providedsimilar to the member 3 encircling the retainer and providing incombination therewith an additional wall supportfor the blockwllic'liaidsin'pr'eventing breakage of the die block from the heavy blowsdelivered by the punch head.

The assembly of the device is as follows: The punch 8'is forced by theoperator into the central aperture in the retainer 1 and when positionedas shown in" Figll, theball 5 engages in the groove 9in'thepu'nch shankpreventin the punch from rotation in-relation to t e retainer andatteiiipted withdrawal' of the punch froiii the retainer is prevented Iby the binding actionof the ball 5 between'the angular wall of theaperture 4 and the wall of the arcuate' groove 9of-the punch'shanks. Itis to be noted that theend of the punch shank 8 en ages against thepunch plate 11 against hich' the retainer is secured so that upwardmovement of the punch is prevented and by the use of the spring pressedball engaging in the arcuate groove in the punch shank the punch islocked in the retainer and is held immovable therein; This is also trueof the die or 'die block 10, the said die being prevented from downwardmovement by the die plate 18' and prevented from rotation or upwardmovement by' the sprin pressed ball 5 enwagim in ale-mute grodve 9 inthe die-bleak r3 V evident that the deviceis'of a simple nature alidaccomplishes the obj this desired and by order to relnoye either'thepunch 'or die from the respective retaineflthe opera-tor may ext'endarod or similar instrument through the ap "ram 12 or 12"" i the-flat faceof either raai'ne1 and fet -e t a tan a or 5% baekinto the aperture 4'or 4* may from and out of the arcuate groove 951 9 ih the punch or" diesea the a peeaee ratifies. It an be noted that the retainers areioiilir'nitied to i of tool bii't'may'he punch drill presses andothermachines where a tool nust meets-ant be hid from metres and at the traitaperture,- a tool 1 retainer heid'in' position e are t ta used in difirelit'types am new 1i5rfgitiidina1 iaaeerasnain relaitifonto' theretainer or chuck within which it secured; In mediate artist-04 tatiohthe were a! owahle the muse tail 's iri rtdwb t groove may be dispensedwith, the ball in this case onl engaging the cylindrical face of thetool s ank thereby preventing withdrawal of the tool from the retainerand at the same time allowing rotation thereof. It is also to be notedthat the groove 9 or 9 in the tool need not necessarily be arcuate in aplane arallel to the longitudinal axis of the tool t is formbeing shownon account of greater ease of manufacture, the necessary characteristicsof the groove being that the groove be arcuatein cross section on'aradius equal to the radiusof the ball so that when the ball-isseated inthe groove the'tool is prevented from 'rotative movement. The

ottom of the groove may be parallel to the longitudinal axis of'the toolor at an angle thereto or arcuatein' form as shown, either formbeingadapted-tobe bindingly engaged by the spring pressed ball'in theretainer wallftopreveiit either rotation or longitudinal'movementof'thetoo'l. This-retainer may be a3ls0* use'd= with square shank toolsand the arcuate groove dispensed with, the-square shanlr fitting in a'square: aperture in the r'etainer thereby preventing rotation of thetool in relation to tlie retainer and the ball' engagin one of thefiat-faces of the shank therekfy' preventing withdrawal of the tool fromthe ret'aine rf Theretainer may be 'niadein different sizeswithdifferent central apertures as illustrated by the retainers 1 and 1-Fig: 1 in'the drawing-to'take-tools of varying sizes and types. "By.positioning the'ahgular aperturese and 4 shown in Fig.1 atoppositeangles; the tendency of the die block'- to travel with the punchisprevented and the tendency of the punch to-remain in' the die block isalso prevented by the 'twee'nthe wall of the angular apertureand thewall of the arcuate groove in the tool.-

Fromtheforegoi-ng description it becomes the mechanism heresliowmthepuiichhead 1% is held in position tioeitactly engage theaperture in thedie block'and thus a device is provided which is veryefilc'ient and-exact a ,epeiaaen and which will we may get out-trader.

Having thus brieflydesciibed- (air memtiofii its utility and:niodeofoperation, what wecla'iin and desiieto' secure by Letters Patentiofthe' United siiatesis Iijra? retainerfor: punches, dies" and simmermels; a base, a supporting member rem'ovabw secured thereto and'llaving'acenliy eie-suppbnfing nfreniber, tli*toolretainer hating I a centralaplerture a spring-pressed emetainer and normaily seaoao extending intothe aperture therein, the tool being adapted to fit in the aperture andseat against the base and having an arcuate groove of a radius greaterthan the radius of the ball in the face thereof in which the ball mayengage to bind the tool in position.

2. In a retainer for punches, dies and similar tools, a base, acentrally apertured retainer detachably secured to the base, the

retainer also having anangular aperture opening thereinto, aspring-pressed ball in the said angular aperture, and a tool having ashank provided with an arcuate groove of a radius greater than theradius of the ball in the side thereof engaged by the ball when theshank is seated against the base in the said aperture of the retainer.

3. In a retainer for punches, dies and similar tools, a base, acentrally apertured retainer removably secured to the base, thetool'having a shank adapted for insertion in the aperture of theretainer, the retainer also having an aperture in the wall thereofextending at an angle to the longitudinal axis of the central apertureand opening thereinto, there also being an opening in the retainerextending from the angular aperture through the face of the retainer, aball fitting within the angular aperture, a spring forcing theball toextend partially into the central aperture of the retainer, 'a recessformedin the surface of the tool shank having a face at an angle to theaxis of the tool against which the ball engages when the shank is[seated against the base, the aperture extending' through the face ofthe retainer into engagement with the base permitting insertion of aninstrument to withdraw the ball from enga ement with the tool.

4:. n a retainer for punches, dies and similar tools, a base, asupporting member having a central circular aperture counterbored at theinner end ad acent the base, means for detachably securing thesupporting member on the base, a retainer having a portion engaging inthe enlarged part of the supporting member and fitting the aperture ofthe supporting member, Said retainer having a central aperture and anaperture at an angle thereto opening into the central aperture, aspring-pressed ball in the angular aperture, and a tool having a notchformed in the face thereof engaged by the ball when the tool ispositioned in the central aperture of the retainer and seated againstthe base.

5. In a tool retainer, :1 base, a centrally apertured retainerdetachably secured to the base, the retainer also having an angularaperture openin into the central aperture, a spring-presse ball in thesaid angular aperture and a tool having a shank adapted for insertion inthe central aperture to engage the base, said shank having an arcuategroove on one side only, said groove being arcuate in form bothlongitudinally and transversely of the axis of the shank, the groovetranversely of the shank being at its deepest part substantially of thesame radius as the ball and longitudinally being formed on an arc of ara ius greater than the radius of the ball.

6. In a retainer for punches, dies and similar tools, a base, acentrally apertured retainer secured to the base, the tool having ashank adapted for insertion 1n said aperture, the retainer also havingan aperture in the Wall thereof extending at an angle to thelongitudinal axis and opening into the central aperture, aspring-pressed ball in said aperture, and a tool having a shank provided with an arcuate groove' in one side thereof of a radius greaterthan the radius of the ball in which the said ball engages.

In testimony whereof we sign this speclfit' n. ca 10 CLEMENT C. RICHARD.

CLARENCE A. RICHARD. OTIS K, RICHARD.

